using System; | |
using System.Messaging; | |
using System.Globalization; | |
using System.Text.RegularExpressions; | |
/* | |
* Licensed to the Apache Software Foundation (ASF) under one or more | |
* contributor license agreements. See the NOTICE file distributed with | |
* this work for additional information regarding copyright ownership. | |
* The ASF licenses this file to You under the Apache License, Version 2.0 | |
* (the "License"); you may not use this file except in compliance with | |
* the License. You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
*/ | |
namespace Apache.NMS.MSMQ.Readers | |
{ | |
/// <summary> | |
/// Utility routines for creating MSMQ message readers. | |
/// </summary> | |
public static class MessageReaderUtil | |
{ | |
private static Regex basicSelectorRegex = | |
new Regex(@"^\s*" + | |
@"(NMSMessageId)\s*=\s*'([^']*)'|" + | |
@"(NMSCorrelationId)\s*=\s*'([^']*)'|" + | |
@"(LookupId)\s*=\s*([-+]{0,1}\d+)" + | |
@"\s*$", | |
RegexOptions.IgnoreCase | RegexOptions.Compiled); | |
/// <summary> | |
/// Creates a message reader for the specified message selector. | |
/// </summary> | |
/// <param name="messageQueue">The MSMQ message queue from which | |
/// messages will be read.</param> | |
/// <param name="messageConverter">A message converter for mapping | |
/// MSMQ messages to NMS messages.</param> | |
/// <param name="selector">The message selector.</param> | |
/// <return>A reader for the specified selector.</return> | |
public static IMessageReader CreateMessageReader( | |
MessageQueue messageQueue, IMessageConverter messageConverter, | |
string selector) | |
{ | |
IMessageReader reader; | |
if(string.IsNullOrEmpty(selector)) | |
{ | |
reader = new NonFilteringMessageReader(messageQueue, | |
messageConverter); | |
} | |
else | |
{ | |
Match match = basicSelectorRegex.Match(selector); | |
if(match.Success) | |
{ | |
if(!string.IsNullOrEmpty(match.Groups[1].Value)) | |
{ | |
reader = new ByIdMessageReader(messageQueue, | |
messageConverter, match.Groups[2].Value); | |
} | |
else if(!string.IsNullOrEmpty(match.Groups[3].Value)) | |
{ | |
reader = new ByCorrelationIdMessageReader(messageQueue, | |
messageConverter, match.Groups[4].Value); | |
} | |
else | |
{ | |
Int64 lookupId = Int64.Parse(match.Groups[6].Value, | |
CultureInfo.InvariantCulture); | |
reader = new ByLookupIdMessageReader(messageQueue, | |
messageConverter, lookupId); | |
} | |
} | |
else | |
{ | |
reader = new BySelectorMessageReader(messageQueue, | |
messageConverter, selector); | |
} | |
} | |
return reader; | |
} | |
} | |
} |